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Rating: 
Summary: A few comments
Review: In reading up on the subject lately, I learned that both films and the CCD's in digital cameras can "see" UV or ultra-violet, which is just beyond the normal human visual range. (Interestingly, bees can see into the UV end of the spectrum, which enables them to see when the nectar is flowing in flowers by enabling them to see the nectar guides in the flowers). Anyway, too much UV light can produce a bluish image, and can affect the saturation and tints of the other colors. UV and skylight filters are great for reducing haze, and for eliminating chromatic desaturation of colors (i.e., the bluish washing out effect that occurs with distance), and enhance sharpness as a result, too. These filters are designed to remove UV and can help to some extent with the bluish cast. UV filters are colorless and skylight filters are pinkish. Both will work well as far as removing excess UV light, but note that skylight filters produce slightly warmer photos because of their pinkish tint. Haze filters work similar to UV filter. Because of light-scattering due to microscopic dust particles in the air, different wavelengths are scattered more or less than others and can cause reduced sharpness. Haze filters can help with this problem. According to the specs, the Tiffen Haze-1 blocks 71% of excess blue at 400 mm wavelength. The Tiffen Haze-2A provides greater UV correction and filters 100% at 400 mm wavelength. Excessive bluish tint frequently occurs in outdoor photography, especially in open shade under a clear, blue sky and near the water front. Unlike pink skylight filters, haze filters are yellowish--the opposite visual color complement to blue, which allows it to counteract a bluish effect. I'd like to thank C-K's digital camera page at Michigan Technical University for much of this information.
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